公开(公告)号：US5649002A

公开(公告)日：1997-07-15

申请号：US357172

申请日：1994-12-13

申请人： Robert H. Brady ,  David Zielski ,  William L. Nutter ,  Alexander J. Marra

发明人： Robert H. Brady ,  David Zielski ,  William L. Nutter ,  Alexander J. Marra

IPC分类号： H04M1/57 ,  H04M3/428 ,  H04M19/04 ,  H04M3/42 ,  H04M1/56

CPC分类号： H04M19/041 ,  H04M1/573 ,  H04M3/428

摘要： A method and apparatus for verifying that a CAS (Customer Premises Equipment Alerting Signal) detect signal, which indicates the presence of a CAS on a transmission channel, is a valid detect signal, includes structure and process steps for suppressing a signal originating at a local telephone in response to the CAS detect signal. A determination is made whether the CAS detect signal remains in a predetermined condition at a predetermined time after the local telephone signal is suppressed. A validity signal is output when the CAS detect signal remains in the predetermined condition at the predetermined time. False detections are thereby minimized by ignoring detections caused by a signal originating at the local telephone.

摘要翻译： 一种用于验证CAS（客户驻地设备警报信号）检测信号的方法和装置，其指示在传输信道上存在CAS是有效的检测信号，包括用于抑制源自本地的信号的结构和处理步骤 电话响应CAS检测信号。 在本地电话信号被抑制之后的预定时间，确定CAS检测信号是否保持在预定条件。 当CAS检测信号在预定时间内保持在预定条件时，输出有效信号。 因此，通过忽略由本地电话产生的信号引起的检测，从而使错误检测最小化。

公开(公告)号：US6122353A

公开(公告)日：2000-09-19

申请号：US892102

申请日：1997-07-14

申请人： Robert H. Brady ,  David Zielski ,  William L. Nutter ,  Alexander J. Marra

发明人： Robert H. Brady ,  David Zielski ,  William L. Nutter ,  Alexander J. Marra

IPC分类号： H04M1/57 ,  H04M3/428 ,  H04M19/04 ,  H04M1/56

CPC分类号： H04M19/041 ,  H04M1/573 ,  H04M3/428

摘要： A method and apparatus for verifying that a CAS (Customer Premises Equipment Alerting Signal) detect signal, which indicates the presence of a CAS on a transmission channel, is a valid detect signal, includes structure and process steps for suppressing a signal originating at a local telephone in response to the CAS detect signal. A determination is made whether the CAS detect signal remains in a predetermined condition at a predetermined time after the local telephone signal is suppressed. A validity signal is output when the CAS detect signal remains in the predetermined condition at the predetermined time. False detections are thereby minimized by ignoring detections caused by a signal originating at the local telephone.

摘要翻译： 一种用于验证CAS（客户驻地设备警报信号）检测信号的方法和装置，其指示在传输信道上存在CAS是有效的检测信号，包括用于抑制源自本地的信号的结构和处理步骤 电话响应CAS检测信号。 在本地电话信号被抑制之后的预定时间，确定CAS检测信号是否保持在预定条件。 当CAS检测信号在预定时间内保持在预定条件时，输出有效信号。 因此，通过忽略由本地电话产生的信号引起的检测，从而使错误检测最小化。